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Certified Used 2020 GMC Sierra 1500 AT4
VIN: 1GTP9EED6LZ340735
Stock #: H6503
68,213 mi.
Vehicle Details
MPG:16/21 (City/Hwy)
Trans.:10-Speed Automatic
Engine:8 Cylinders
Drivetrain:Four Wheel Drive
Fuel Type:Gasoline
Ext. Color:Onyx Black
Int. Color:Jet Black With Kalahari Accents
Retail Price
$42,925Stillwell Discount
-$2,038Stillwell Price
$40,887Description
Premium Strength Meets Off-Road Confidence
Some trucks are built for pavement. The 2020 GMC Sierra 1500 AT4 4WD is built for drivers who expect more from their pickup. Finished in bold Onyx Black with a distinctive Jet Black interior accented with Kalahari, this Sierra blends serious capability with premium comfort in a way that feels equally at home on rugged trails, job sites, and daily drives.
Power comes from the proven 5.3-liter EcoTec3 V8 engine, paired with a responsive 8-speed automatic transmission that delivers smooth, confident acceleration and dependable pulling power. Whether you’re towing equipment or heading out for a weekend adventure, the Sierra’s V8 provides the kind of strength truck owners expect from GMC.
Inside, the cabin reflects the AT4’s balance of ruggedness and refinement. Supportive leather-appointed seating is paired with both heated front seats and ventilated front seats, keeping drivers comfortable through Michigan summers and Midwest winters alike. The heated steering wheel and driver memory system for seat and mirrors further enhance everyday comfort, ensuring every drive begins exactly the way you like it.
Technology in the Sierra is designed to make driving easier and more connected. The intuitive premium GMC infotainment system with navigation keeps routes clear while the rich sound of the Bose premium audio system with subwoofer fills the cabin. Everyday convenience is handled through wireless charging, universal home remote, and remote vehicle start, helping the truck feel as smart as it is capable.
Safety and driver awareness are strengthened through the Driver Alert Package II, which includes technologies like forward collision alert and lane keep assist to help monitor the road ahead. Maneuvering the truck in tight areas becomes easier with the combination of front park assist, rear park assist, and the rear vision camera, providing added confidence whether backing into a parking space or navigating crowded areas.
Daily drives might carry this Sierra through Coldwater, Marshall, and Jackson along US-12, M-60, and I-94 across Branch County, Calhoun County, and Jackson County. From there the road can stretch south toward Bryan, Wauseon, and Defiance along US-24, State Route 66, and State Route 15 through Williams County, Fulton County, and Defiance County, before continuing west toward Angola, Auburn, and Fort Wayne along I-69, US-6, and State Road 8 across Steuben County, DeKalb County, and Allen County.
The result is a truck that combines off-road strength, everyday luxury, and advanced technology into One confident package.
Because Everything We Do Is Driven By You.
#GMCSierra1500 #SierraAT4 #AT4 #LuxuryTruck #V8Truck #OffRoadTruck #Certified #StillwellFord #HillsdaleMI #ColdwaterMI #MarshallMI #JacksonMI #BranchCountyMI #CalhounCountyMI #JacksonCountyMI #US12 #M60 #I94 #BryanOH #WauseonOH #DefianceOH #WilliamsCountyOH #FultonCountyOH #DefianceCountyOH #US24 #OH66 #OH15 #AngolaIN #AuburnIN #FortWayneIN #SteubenCountyIN #DeKalbCountyIN #AllenCountyIN #I69 #US6 #IN8 #everythingwedoisdrivenbyyou
A rugged premium pickup delivering V8 power, off-road confidence, and the refined comfort expected from a GMC AT4.
Some trucks are built for pavement. The 2020 GMC Sierra 1500 AT4 4WD is built for drivers who expect more from their pickup. Finished in bold Onyx Black with a distinctive Jet Black interior accented with Kalahari, this Sierra blends serious capability with premium comfort in a way that feels equally at home on rugged trails, job sites, and daily drives.
Power comes from the proven 5.3-liter EcoTec3 V8 engine, paired with a responsive 8-speed automatic transmission that delivers smooth, confident acceleration and dependable pulling power. Whether you’re towing equipment or heading out for a weekend adventure, the Sierra’s V8 provides the kind of strength truck owners expect from GMC.
Inside, the cabin reflects the AT4’s balance of ruggedness and refinement. Supportive leather-appointed seating is paired with both heated front seats and ventilated front seats, keeping drivers comfortable through Michigan summers and Midwest winters alike. The heated steering wheel and driver memory system for seat and mirrors further enhance everyday comfort, ensuring every drive begins exactly the way you like it.
Technology in the Sierra is designed to make driving easier and more connected. The intuitive premium GMC infotainment system with navigation keeps routes clear while the rich sound of the Bose premium audio system with subwoofer fills the cabin. Everyday convenience is handled through wireless charging, universal home remote, and remote vehicle start, helping the truck feel as smart as it is capable.
Safety and driver awareness are strengthened through the Driver Alert Package II, which includes technologies like forward collision alert and lane keep assist to help monitor the road ahead. Maneuvering the truck in tight areas becomes easier with the combination of front park assist, rear park assist, and the rear vision camera, providing added confidence whether backing into a parking space or navigating crowded areas.
Daily drives might carry this Sierra through Coldwater, Marshall, and Jackson along US-12, M-60, and I-94 across Branch County, Calhoun County, and Jackson County. From there the road can stretch south toward Bryan, Wauseon, and Defiance along US-24, State Route 66, and State Route 15 through Williams County, Fulton County, and Defiance County, before continuing west toward Angola, Auburn, and Fort Wayne along I-69, US-6, and State Road 8 across Steuben County, DeKalb County, and Allen County.
The result is a truck that combines off-road strength, everyday luxury, and advanced technology into One confident package.
Because Everything We Do Is Driven By You.
#GMCSierra1500 #SierraAT4 #AT4 #LuxuryTruck #V8Truck #OffRoadTruck #Certified #StillwellFord #HillsdaleMI #ColdwaterMI #MarshallMI #JacksonMI #BranchCountyMI #CalhounCountyMI #JacksonCountyMI #US12 #M60 #I94 #BryanOH #WauseonOH #DefianceOH #WilliamsCountyOH #FultonCountyOH #DefianceCountyOH #US24 #OH66 #OH15 #AngolaIN #AuburnIN #FortWayneIN #SteubenCountyIN #DeKalbCountyIN #AllenCountyIN #I69 #US6 #IN8 #everythingwedoisdrivenbyyou
A rugged premium pickup delivering V8 power, off-road confidence, and the refined comfort expected from a GMC AT4.
Standard Features
- AT4 Preferred Package
- AT4 Premium Package
- Driver Alert Package I
- Driver Alert Package II
- Preferred Equipment Group 4SB
- Trailering Package
- 6 Speakers
- 6-Speaker Audio System Feature
- AM/FM radio: SiriusXM with 360L
- HD Radio
- Premium audio system: GMC Infotainment System
- Premium Bose 7-Speaker Sound System
- Radio data system
- Radio: Premium GMC Infotainment Sys w/Multi-Touch
- Radio: Premium GMC Infotainment Sys w/Navigation
- SiriusXM w/360L
- Steering Wheel Audio Controls
- Air Conditioning
- Automatic temperature control
- Electric Rear-Window Defogger
- Front dual zone A/C
- Rear window defroster
- 12-Volt Rear Auxiliary Power Outlet
- 120-Volt Bed Mounted Power Outlet
- 120-Volt Instrument Panel Power Outlet
- Driver Memory
- Memory seat
- Power driver seat
- Power Front Passenger Windows w/Express Up/Down
- Power Front Windows w/Driver Express Up/Down
- Power Rear Windows w/Express Down
- Power steering
- Power windows
- Remote keyless entry
- Remote Vehicle Starter System
- Steering wheel mounted audio controls
- Universal Home Remote
- Electrical Lock Control Steering Column
- Manual Tilt-Wheel & Telescoping Steering Column
- Off-Road Suspension
- Speed-sensing steering
- Traction control
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Dual front side impact airbags
- Front anti-roll bar
- Front wheel independent suspension
- Keyless Open & Start
- Low tire pressure warning
- Occupant sensing airbag
- Overhead airbag
- Power Door Locks
- Power Sunroof
- Brake assist
- Electronic Stability Control
- Hill Descent Control
- Delay-off headlights
- Front fog lights
- Fully automatic headlights
- Perimeter Lighting
- Panic alarm
- Security system
- Theft Deterrent System (Unauthorized Entry)
- Adaptive Cruise Control – Camera
- Speed control
- Heavy-Duty Rear Locking Differential
- 170 Amp Alternator
- Auxiliary External Transmission Oil Cooler
- Engine Block Heater
- 6″ Rectangular Black Tubular Assist Steps (LPO)
- Auto-dimming door mirrors
- Body-Color Surround Grille
- Bumpers: body-color
- Front & Rear Black Molded Splash Guards (LPO)
- Front License Plate Kit
- Heated door mirrors
- High Gloss Black Mirror Caps
- High-Capacity Air Filter
- IntelliBeam Automatic High Beam On/Off
- LED Cargo Area Lighting
- Power door mirrors
- ProGrade Trailering System
- Rear step bumper
- Rear Wheelhouse Liners
- Spray-On Pickup Bed Liner w/AT4 Logo
- 2 USB Ports
- 2 USB Ports (1st Row)
- 4.2″ Diagonal Color Display Driver Info Center
- 4G LTE Wi-Fi Hotspot Capable
- All-Weather Floor Liners w/AT4 Logo (LPO)
- Apple CarPlay/Android Auto
- Auto-dimming Rear-View mirror
- Automatic Emergency Braking
- Color-Keyed Carpeting Floor Covering
- Compass
- Driver door bin
- Driver vanity mirror
- Floor-Mounted Center Console
- Following Distance Indicator
- Forward Collision Alert
- Front Pedestrian Braking
- Front reading lights
- GMC Connected Access Capable
- HD Rear Vision Camera
- Heated steering wheel
- Illuminated entry
- Lane Change Alert w/Side Blind Zone Alert
- Lane Keep Assist w/Lane Departure Warning
- OnStar & GMC Connected Services Capable
- Outside temperature display
- Overhead console
- Passenger vanity mirror
- Rear Cross Traffic Alert
- Rear Dual USB Charging-Only Ports
- Rear reading lights
- Rear seat center armrest
- Safety Alert Seat
- Tachometer
- Telescoping steering wheel
- Tilt steering wheel
- Trip computer
- Ultrasonic Front & Rear Park Assist
- Voltmeter
- Wireless Charging
- 10-Way Power Driver Seat Adjuster w/Lumbar
- 10-Way Power Passenger Seat Adjuster w/Lumbar
- Front Bucket Seats
- Front Center Armrest
- Heated 2nd Row Outboard Seats
- Heated Driver & Front Outboard Passenger Seating
- Heated front seats
- Heated rear seats
- Perforated Leather-Appointed Front Seat Trim
- Power passenger seat
- Split folding rear seat
- Ventilated Driver & Front Passenger Seats
- Ventilated front seats
- Passenger door bin
- Hitch Guidance
- Hitch Guidance w/Hitch View
- In-Vehicle Trailering App
- Integrated Trailer Brake Controller
- Red Recovery Hooks
- 18″ x 8.5″ Machined Aluminum Wheels
- Alloy wheels
- Wheel Locks (Set of 4) (LPO)
- Wheels: 20″ x 9″ Machined Aluminum
- Deep-Tinted Glass
- Power Sliding Rear Window w/Rear Defogger
- Variably intermittent wipers
- 3.23 Rear Axle Ratio
VEHICLE DATA
Certain specifications, prices and equipment data have been provided under license from Chrome Data Solutions (\’Chrome Data\’). © 2026 Chrome Data Solutions, LP. All Rights Reserved. This information is supplied for personal use only and may not be used for any commercial purpose whatsoever without the express written consent of Chrome Data. Chrome Data makes no guarantee or warranty, either expressed or implied, including without limitation any warranty of merchantability or fitness for particular purpose, with respect to the data presented here. All specifications, prices and equipment are subject to change without notice.
ESTIMATE MPG
EPA mileage ratings are supplied by Chrome Data Solutions, LP for comparison purposes only. Your actual mileage will vary, depending on how you drive and maintain your vehicle, driving conditions, battery pack age/condition (hybrid models only) and other factors.
Based on 2019 EPA mileage ratings. Your MPGe/MPG and driving range will vary depending on driving conditions, how you drive and maintain your vehicle, battery-pack age/condition, and other factors.
PRICING
Vehicle pricing is believed to be accurate. Tax, title and registration are not included in prices shown unless otherwise stated. Manufacturer incentives may vary by region and are subject to change. Vehicle information & features are based upon standard equipment and may vary by vehicle. Monthly payments may be higher or lower based upon incentives, qualifying programs, credit qualifications, & residency. No claims, or warranties are made to guarantee the accuracy of vehicle pricing, payments or actual equipment. Call to confirm accuracy of any information.
